Low Dielectric Resin Formulation for High-Frequency Circuit Boards
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Solution Overview
Problem
Current resin formulations for high-frequency devices face challenges in achieving a balance between high thermal resistance, low dielectric constant, and compliance with UL-94 V0 fire rating without using halogen or phosphor-based flame retardants, which are often eco-unfriendly and inefficient.
Innovation Solution
A low dielectric constant resin formulation comprising diisocyanate, poly(2,6-dialkyl-1,4-phenylene oxide), and a solvent, which undergoes prepolymerization to form a resin prepolymer that can be heat-cured, resulting in a halogen-free, phosphor-free composite with enhanced thermal resistance and dielectric properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halogen or phosphor-based flame retardants are used to meet UL-94 V0 fire rating, then flame retardancy is improved, but environmental friendliness deteriorates
Solution Approach 1:
The patent extracts and eliminates halogen and phosphor-based flame retardants from the resin formulation, replacing them with an organic-inorganic hybrid system that achieves UL-94 V0 rating without harmful substances. The formulation uses epoxy resin combined with specific inorganic fillers and organic additives to attain flame retardancy through alternative mechanisms.
Solution Approach 2:
The patent employs a composite material system comprising epoxy resin, inorganic fillers (such as aluminum hydroxide, magnesium hydroxide, or勃姆石), and organic additives. This composite approach achieves flame retardancy through synergistic effects: inorganic fillers provide thermal stability and char formation, while organic additives enhance flame resistance, collectively meeting UL-94 V0 without halogen or phosphor.
2Reliability
If inorganic flame retardant powders are incorporated to improve flame retardancy, then flame retardancy is improved, but dielectric constant increases
Solution Approach 1:
The patent applies local quality by selecting specific inorganic fillers with low dielectric constants and optimizing their distribution within the epoxy matrix. Rather than uniformly dispersing all types of inorganic flame retardants, the formulation targets specific materials (such as aluminum hydroxide or magnesium hydroxide) that provide flame retardancy while maintaining low dielectric properties in critical regions.
Solution Approach 2:
The patent changes key parameters including the type, size, and concentration of inorganic fillers to optimize both flame retardancy and dielectric properties. By controlling filler particle size distribution and using surface-modified inorganic materials, the formulation achieves UL-94 V0 rating while keeping dielectric constant low, thereby reducing signal loss in high-frequency applications.
3Temperature
If conventional epoxy resin is used to achieve high thermal resistance, then thermal resistance is improved, but dielectric constant increases causing signal loss
Solution Approach 1:
The patent creates a composite epoxy formulation that combines epoxy resin with specifically selected inorganic fillers and organic additives. This composite structure maintains the high thermal resistance of conventional epoxy (Tg > 150°C) while the low-dielectric-constant fillers and optimized formulation reduce the overall dielectric constant, thereby simultaneously achieving thermal performance and low signal loss.
Solution Approach 2:
The patent modifies the chemical and physical parameters of the epoxy system by incorporating crosslinking agents, optimizing curing conditions, and selecting specific filler types. These parameter changes enable the resin to maintain high glass transition temperature (thermal resistance) while reducing dielectric constant through controlled molecular structure and filler-matrix interactions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting resin composite exhibits a dielectric constant of 3.0-4.0, a glass transition temperature above 180°C, and meets the UL-94 V0 fire rating, providing improved thermal resistance and reduced signal loss, making it suitable for high-frequency applications while being eco-friendly.
Implementation Method 1
heating the low dielectric constant resin formulation to perform a prepolymerization reaction to form a low dielectric constant resin prepolymer solution
Implementation Method 2
heating the low dielectric constant resin prepolymer solution to obtain the above described low dielectric constant composition
Data Source
AI summary
The present disclosure provides a low dielectric constant resin formulation comprising 20-150 parts by weight of diisocyanate, 20-400 parts by weight of poly(2,6-dialkyl-1,4-phenylene oxide), and 200-650 parts by weight of a solvent. The present disclosure also provides a low dielectric constant resin prepolymer, composition, and composite produced from the above formulation, and a method for preparing the low dielectric constant resin prepolymer solution.